package com.xyc.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.xyc.common.to.es.SkuEsModel;
import com.xyc.common.utils.R;
import com.xyc.gulimall.search.config.GulimallElasticSearchConfig;
import com.xyc.gulimall.search.constant.EsConstant;
import com.xyc.gulimall.search.feign.ProductFeignService;
import com.xyc.gulimall.search.service.MallSearchService;
import com.xyc.gulimall.search.vo.AttrResponseVo;
import com.xyc.gulimall.search.vo.BrandVo;
import com.xyc.gulimall.search.vo.SearchParam;
import com.xyc.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.MultiBucketsAggregation;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    //去es进行检索
    @Override
    public SearchResult search(SearchParam searchParam) {
        //1、动态构建出查询需要的DSL语句
        SearchResult result = null;

        //1准备检索请求
        SearchRequest searchRequest = buildSearchRequest(searchParam);

        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //3、分析响应数据封装成我们需要的格式
            result = buildSearchResult(response, searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }

    /**
     * 准备检索请求
     * 模糊匹配、过滤（按照属性、分类、品牌、加个区间、库存）、排序、分页、高亮、聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam searchParam) {
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();//构建DSL语句的

        /**
         * 查询：模糊匹配、过滤（按照属性、分类、品牌、加个区间、库存）
         */
        //1、构建bool、query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、must-模糊查询
        if (!StringUtils.isEmpty(searchParam.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", searchParam.getKeyword()));
        }
        //1.2、bool-filter - 按照三级分类id查询
        if (searchParam.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", searchParam.getCatalog3Id()));
        }
        //1.2、bool-filter - 按照品牌id查询
        if (searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", searchParam.getBrandId()));
        }
        //1.2、bool-filter - 按照所有指定的属性进行查询
        if (searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0) {
            for (String attr : searchParam.getAttrs()) {
                BoolQueryBuilder nestBoolQuery = QueryBuilders.boolQuery();
                String[] s = attr.split("_");
                String attrId = s[0];//检索的属性id
                String[] attrValue = s[1].split(":");//这个属性的检索用的值
                nestBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestBoolQuery.must(QueryBuilders.termQuery("attrs.attrValue", attrValue));
                //每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }

        //1.2、bool-filter - 按照库存是否有进行查询
        if (searchParam.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", searchParam.getHasStock() == 1));
        }

        //1.2、bool-filter - 按照价格区间进行查询
        if (!StringUtils.isEmpty(searchParam.getSkuPrice())) {
            //1_500/_500/500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = searchParam.getSkuPrice().split("_");
            if (s.length == 2) {
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (searchParam.getSkuPrice().startsWith("_")) {//以短横杠开始
                    rangeQuery.lte(s[0]);
                }
                if (searchParam.getSkuPrice().endsWith("_")) {//以短横杠结尾
                    rangeQuery.gte(s[0]);
                }
            }

            boolQuery.filter(rangeQuery);
        }


        //把以前的所有条件都拿来进行封装
        searchSourceBuilder.query(boolQuery);

        /**
         * 排序、分页、高亮
         */
        //2.1、排序
        if (!StringUtils.isEmpty(searchParam.getSort())) {
            String sort = searchParam.getSort();
            String[] s = sort.split("_");
            searchSourceBuilder.sort(s[0], s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC);
        }

        //2.2、分页    (pageNum-1)*size
        searchSourceBuilder.from((searchParam.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        searchSourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3、高亮
        if (!StringUtils.isEmpty(searchParam.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();

            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");

            searchSourceBuilder.highlighter(highlightBuilder);
        }

        /**
         * 聚合分析
         */
        //1、品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        searchSourceBuilder.aggregation(brand_agg);

        //2、分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        searchSourceBuilder.aggregation(catalog_agg);

        //3、属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));

        attr_agg.subAggregation(attr_id_agg);
        searchSourceBuilder.aggregation(attr_agg);

        String s = searchSourceBuilder.toString();
        System.out.println("构建的DSL" + s);

        return
                new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, searchSourceBuilder);
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam searchParam) {

        SearchResult result = new SearchResult();
        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(searchParam.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
            result.setProducts(esModels);
        }

        //2、当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        if (attr_agg != null) {
            ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
            for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
                SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
                //1、得到属性id
                long attrId = bucket.getKeyAsNumber().longValue();
                //2、得到属性名字
                String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
                //3、得到属性的所有值
                List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(MultiBucketsAggregation.Bucket::getKeyAsString).collect(Collectors.toList());

                attrVo.setAttrId(attrId);
                attrVo.setAttrName(attrName);
                attrVo.setAttrValue(attrValues);



                attrVos.add(attrVo);
            }

            result.setAttrs(attrVos);
        }

        //3、当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        if (brand_agg != null) {
            for (Terms.Bucket bucket : brand_agg.getBuckets()) {
                SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
                //1、得到品牌的id
                long brandId = bucket.getKeyAsNumber().longValue();
                //2、得到品牌的名字
                String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
                //3、得到品牌的图片
                String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();

                brandVo.setBrandId(brandId);
                brandVo.setBrandName(brandName);
                brandVo.setBrandImg(brandImg);
                brandVos.add(brandVo);
            }

            result.setBrands(brandVos);
        }

        //4、当前所有商品涉及到的所有分类信息
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        if (catalog_agg != null) {
            for (Terms.Bucket bucket : catalog_agg.getBuckets()) {
                SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
                //得到分类id
                String keyAsString = bucket.getKeyAsString();
                catalogVo.setCatalogId(Long.valueOf(keyAsString));

                //得到分类名
                ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
                String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
                catalogVo.setCatalogName(catalog_name);
                catalogVos.add(catalogVo);
            }
            result.setCatalogs(catalogVos);
        }

        //5、分页信息-页码
        result.setPageNum(searchParam.getPageNum());
        //5、分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //5、分页信息-总页码
        int totalPages = (int) (total % EsConstant.PRODUCT_PAGESIZE == 0 ?
                total / EsConstant.PRODUCT_PAGESIZE : (total / EsConstant.PRODUCT_PAGESIZE + 1));
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6、构建面包屑导航功能
        if (searchParam.getAttrs() != null && !searchParam.getAttrs().isEmpty()) {
            List<SearchResult.NavVo> collect = searchParam.getAttrs().stream().map(attr -> {
                //1、分析每个attrs传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();

                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    String jsonString = JSON.toJSONString(r.get("attr"));
                    System.out.println("远程调用的面包屑：" + jsonString);
                    AttrResponseVo attrResponseVo = JSON.parseObject(jsonString, AttrResponseVo.class);

                    navVo.setNavName(attrResponseVo.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                //2、取消面包屑以后，我们要跳转到哪个地方，将请求地址的url里面的当前条件置空
                String replace = replaceQueryString(searchParam, attr, "attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }

        //品牌、分类
        if (searchParam.getBrandId() != null && !searchParam.getBrandId().isEmpty()) {
            List<SearchResult.NavVo> navVos = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();

            navVo.setNavName("品牌");
            // TODO 远程调用查询所有品牌
            R r = productFeignService.brandInfos(searchParam.getBrandId());
            if (r.getCode() == 0) {
                String jsonString = JSON.toJSONString(r.get("brand"));
                System.out.println("远程调用：" + jsonString);
                List<BrandVo> brandVoList = JSON.parseArray(jsonString, BrandVo.class);

                System.out.println("brandIdList:" + brandVoList);
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brandVoList) {
                    buffer.append(brandVo.getName()).append(";");
                    replace = replaceQueryString(searchParam, brandVo.getBrandId() + "", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }
            navVos.add(navVo);
        }

        // TODO 分类，不需要导航取消


        System.out.println("结果集：" + result);
        return result;
    }

    private static String replaceQueryString(SearchParam searchParam, String value, String key) {
        String encode = URLEncoder.encode(value, StandardCharsets.UTF_8);
        encode = encode.replace("+", "%20");//浏览器对空格编码和Java不一样
        return searchParam.get_queryString().replace("&" + key + "=" + encode, "");
    }
}









